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THE MUSCULAR SYSTEM
The sacro-spinalis (fig. 33) varies in the degree of fusion or separateness of its three component column?, which are as in Man. In one Chimpanzee I found the
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FIG. 33.—The sacro-spinalis muscle iu the Chimpanzee. Comp.y complexus; L.A.S., levator anguli scapulce; 0-T, omo-trachelian : H.M.» rhomboideus ; S.P.S., serratus posticus superior. Other letters described in the test.
columns entirely separate, but in two others the outer and middle columns fused in the greater part of the back ; but the combined mass broke up into slips in the neck. The inner column separated off in the upper thoracic